Please help. Will give 15 points, thanks and brainliest Expand and simplify (2x + 5)(2x – 5)(3x + 7)

Write the slope intercept equation for line ab.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams